Analog Devices Inc. AD7866ARUZ-REEL

Overview

AD7866ARUZ-REEL from Analog Devices is a dual-channel, 12-bit, 1 MSPS successive approximation ADC with integrated 2.5 V reference, simultaneous sampling capability, and SPI/QSPI/MICROWIRE/DSP-compatible serial interface. It operates from a single 2.7 V to 5.25 V supply, delivers 70 dB SNR at 300 kHz input, and supports –40°C to +125°C industrial operation in a 20-lead TSSOP package.

For engineers reviewing the AD7866ARUZ-REEL datasheet, AD7866ARUZ-REEL pinout, AD7866ARUZ-REEL application, or AD7866ARUZ-REEL equivalent, key selection considerations include simultaneous dual-channel conversion timing, on-chip reference accuracy (±15 mV over temperature), channel-to-channel isolation (–88 dB), flexible analog input range selection (0–VREF or ±VREF), and low-power operation (11.4 mW max at 3 V/1 MSPS).

Technical Context

The AD7866ARUZ-REEL integrates two independent SAR ADCs, each with a dedicated track-and-hold amplifier supporting >10 MHz full-power bandwidth and 50 ps typical aperture jitter. Conversion is initiated on the falling edge of CS, with no pipeline delay and deterministic 16-SCLK conversion time (800 ns at 20 MHz SCLK).

It features dual serial data outputs (DOUTA/DOUTB) for simultaneous result readout, configurable input ranges via RANGE pin (0–VREF straight binary or ±VREF twos complement), and reference flexibility: internal 2.5 V reference (±1% initial accuracy, 50 ppm/°C TC), external reference via VREF, or independent external references per ADC via DCAPA/DCAPB.

Key Specifications

Pinout & Package

AD7866ARUZ-REEL is housed in a 20-lead Thin Shrink Small Outline Package (TSSOP), RoHS-compliant and moisture-sensitive level 3 (MSL3). The package footprint measures 6.5 mm × 4.4 mm × 1.1 mm (max height), with 0.65 mm lead pitch and exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel SAR ADC applications.

Compared with AD7865ARUZ-REEL and ADS8325IPW, the AD7866ARUZ-REEL uniquely balances dual-channel simultaneity, 12-bit precision, 1 MSPS throughput, and ultra-low 11.4 mW power-making it irreplaceable in space-constrained, thermally sensitive, or phase-coherent multi-signal acquisition systems.

Availability

AD7866ARUZ-REEL is available at Aetrix Electronics and suitable for motor control, industrial process monitoring, medical diagnostics, and automotive battery management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7866ARUZ-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7866ARUZ-REEL belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, low-power, multi-channel data acquisition in harsh industrial and automotive environments.

FAQ

What is the maximum sampling rate supported by the AD7866ARUZ-REEL?

The AD7866ARUZ-REEL supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz serial clock (SCLK) and 16-SCLK conversion time. This rate is fully specified across its operating temperature range (–40°C to +125°C) and supply voltage range (2.7 V to 5.25 V). At lower SCLK frequencies, the throughput scales linearly-for example, 10 MHz SCLK yields 500 kSPS-enabling flexible power-throughput trade-offs in the AD7866ARUZ-REEL design.

Does the AD7866ARUZ-REEL require an external reference voltage?

No, the AD7866ARUZ-REEL includes an on-chip 2.5 V reference with ±1% initial accuracy and ±15 mV total drift over –40°C to +125°C, sufficient for most industrial applications. External reference is optional: it can be applied via VREF (shared) or DCAPA/DCAPB (independent per ADC) when REF SELECT is high or when VREF is tied to AGND. The AD7866ARUZ-REEL's internal reference eliminates BOM cost and board area unless tighter than ±0.6% full-scale accuracy is required.

How does the AD7866ARUZ-REEL handle simultaneous conversion of two channels?

The AD7866ARUZ-REEL contains two fully independent SAR ADCs, each with its own track-and-hold amplifier, allowing true simultaneous sampling of VA1/VA2 and VB1/VB2 on the falling edge of CS. Conversion results appear concurrently on DOUTA and DOUTB 16 SCLK cycles later, with no pipeline delay or inter-channel timing skew. This architecture ensures phase coherence critical for motor control and differential measurements-unlike multiplexed single-ADC solutions where channel switching introduces inherent delay.

What power-saving modes does the AD7866ARUZ-REEL offer?

The AD7866ARUZ-REEL provides three power states: Normal Mode (3.8 mA at 3 V/1 MSPS), Partial Power-Down (560 µA static at 100 kSPS), and Full Power-Down (1 µA at –40°C to +85°C). Power reduction is achieved by gating internal clocks and bias currents while preserving register state. The AD7866ARUZ-REEL exits Full Power-Down in <1 µs, enabling rapid wake-up for burst-mode acquisition-ideal for battery-powered condition monitoring systems.

Is the AD7866ARUZ-REEL pin-compatible with other members of the AD786x family?

Yes, the AD7866ARUZ-REEL shares identical 20-TSSOP pinout and electrical interface with AD7865ARUZ-REEL (14-bit) and AD7862ARUZ-REEL (12-bit, 250 kSPS), enabling drop-in upgrades or downgrades based on resolution and speed requirements. All share the same CS/SCLK/DOUTA/DOUTB timing, REF SELECT/RANGE/A0 control logic, and AVDD/DVDD/VDRIVE supply structure-simplifying hardware reuse and reducing redesign effort when selecting among AD786x variants.